Finding the Fourth Proportional to 72,049.60, 99,425.28 and 40,217.86

Step by Step Solution

1. Step 1: Write the proportion equation
   72,049.60 : 99,425.28 = 40,217.86 : x
2. Step 2: Convert to fraction form
   72,049.60/99,425.28 = 40,217.86/x
3. Step 3: Cross multiply
   72,049.60x = 99,425.28 × 40,217.86
4. Step 4: Simplify right side
   72,049.60x = 3,998,671,991.50
5. Step 5: Solve for x
   x = 3,998,671,991.50/72,049.60
6. Step 6: Final answer
   x = 55,498.88